This practice-used jersey was worn by Mike O'Connor during batting practice of the 2012 MLB season. It has been obtained under the auspices of the Major League Baseball Authentication Program and can be verified by its numbered hologram at MLB.com. It also comes with an individually numbered, tamper-evident hologram from Fanatics Authentic. To ensure authenticity, the hologram can be reviewed online. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud. Please note that this jersey may have imperfections due to in game play.